HMRC Crypto Voluntary Disclosure

Start with the records and the affected years

If crypto income or gains were left out of your tax reporting, the first task is to establish what happened and whether tax is unpaid. Having traded crypto does not, on its own, establish a liability. The transactions, costs, losses, income and rules for each relevant tax year need to be considered.

Gather exchange exports, wallet histories, bank records, earlier returns and correspondence with HMRC. Make a list of the tax years involved and any gaps in the records. Keep the calculations and assumptions supporting the figures you submit.

This guide concerns individuals. Company tax, residence issues and formal investigations may need a different approach.

Choose the correct route

HMRC provides a dedicated service for unpaid tax on cryptoassets. Its guidance says income or gains from the current or previous tax year should be declared through Self Assessment. Do not assume every omitted transaction belongs in the historic disclosure service. [1]

Check whether you need to file a return, amend one or use a disclosure route. If the issue includes non-crypto liabilities, an offshore element or suspected deliberate wrongdoing, obtain advice on the appropriate facility. The Digital Disclosure Service, Worldwide Disclosure Facility and Contractual Disclosure Facility have different purposes and requirements. Do not assume their procedures or deadlines are interchangeable. [2] [3] [4]

If several years are involved, our guide to backdated crypto tax returns explains how amendment, outstanding-return and disclosure routes differ.

Tell your adviser if HMRC has already written to you. An enquiry or investigation may affect how the correction should be handled. The companion guide covers responding to a letter: responding to an HMRC crypto letter.

What makes a disclosure unprompted

HMRC considers whether, at the time of disclosure, you had reason to believe it had discovered or was about to discover the relevant issue. If you had no such reason, the disclosure is unprompted; otherwise it is prompted. The fact that no letter has arrived is not sufficient on its own to decide the answer. [5]

Earlier disclosure may allow lower minimum penalties where the relevant regime treats it as unprompted. The result still depends on the failure, behaviour and quality of disclosure. Professional involvement and speed alone do not guarantee a particular classification or penalty. [5]

Reconstruct the calculations

Separate potential capital disposals from income receipts. Reconcile transfers between your own wallets and identify duplicate imports, missing acquisitions and inconsistent valuations. Use sterling values and the rules applicable to each year. A software report is useful working material, but unresolved classifications should be checked rather than accepted automatically. [6]

For DeFi, identify the arrangement and rights involved, not just the product label. Our DeFi guide explains why income and capital treatment can differ: UK DeFi tax.

Years penalties and interest

HMRC's crypto service describes coverage of four years where reasonable care was taken, up to six where sufficient care was not taken, and up to twenty for deliberate underpayment. Those descriptions should not be treated as a universal rule for every statutory failure or offshore case. Obtain advice on which assessment time limits apply to your facts. [1] [7]

Calculate tax, interest and any penalty separately. The rules for an inaccurate return differ from those for failing to notify. Explain the behaviour and evidence honestly; do not select a category merely because it produces the lowest amount. HMRC can question the figures and classification. A disagreement does not, by itself, establish deliberate behaviour.

Submitting and paying

For the cryptoasset disclosure service, prepare the tax, interest and penalty calculations before submitting. HMRC issues a payment reference and requires payment within 30 days of submission. If you cannot pay within that period, contact HMRC to discuss the position; do not assume a payment arrangement is automatic. Other facilities have their own procedures. [1]

Retain the submitted disclosure, calculations, acknowledgement and payment evidence. Respond to requests for information and correct any material omission you identify. Submission is not the same as HMRC accepting the offer.

What CARF changes

The first UK provider reports cover calendar year 2026 and are due between 1 January and 31 May 2027. This reporting increases the information available to HMRC. It does not create a universal deadline before which every disclosure is unprompted, or establish a liability without considering the underlying transactions. [8]

Getting professional help

An adviser can help reconstruct records, assess the relevant years and route, prepare calculations and deal with HMRC questions. There is no guaranteed penalty saving or immunity from further checks.

If you would like to enquire about help, visit our enquiry form. We review enquiries before making an appropriate introduction to our accountancy partner. The firm decides whether to accept the matter and agrees its fees with you.

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This guide is for general information only and does not constitute tax advice. Tax rules change and individual circumstances vary. Always consult a qualified tax adviser before making decisions about your tax position. Nothing on this website creates a professional relationship.

Sources

Last reviewed: 14 September 2026.

• [1] Tell HMRC about unpaid tax on cryptoassets
• [2] Your guide to making a disclosure
• [3] Worldwide Disclosure Facility
• [4] Contractual Disclosure Facility
• [5] HMRC CH403202
• [6] Selling cryptoassets
• [7] HMRC assessment time limits CH51300
• [8] CARF reporting

HMRC material is available under the Open Government Licence v3.0.

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